Last year, a fountain of dust was spotted streaming from Rosetta’s comet, prompting the question: how was it powered? Scientists now suggest the outburst was driven from inside the comet, perhaps released from ancient gas vents or pockets of hidden ice.
via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_finds_comet_plume_powered_from_below
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